3,701 research outputs found
Translation of Time-Reversal Violation in the Neutral K-Meson System into a Table-Top Mechanical System
Weak interactions break time-reversal (T) symmetry in the two-state system of
neutral K mesons. We present and discuss a two-state mechanical system, a
Foucault-type pendulum on a rotating table, for a full representation of K0
K0bar transitions by the pendulum motions including T violation. The pendulum
moves with two different oscillation frequencies and two different magnetic
dampings. Its equation of motion is identical with the differential equation
for the real part of the CPT-symmetric K-meson wave function. The pendulum is
able to represent microscopic CP and T violation with CPT symmetry owing to the
macroscopic Coriolis force which breaks the symmetry under reversal-of-motion.
Video clips of the pendulum motions are shown as supplementary material.Comment: 11 pages, 5 figures, 1 external url with video clip
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FOREVER: Fault/intrusiOn REmoVal through Evolution & Recovery
The goal of the FOREVER project is to develop a service for Fault/intrusiOn REmoVal through Evolution & Recovery. In order to achieve this goal, our work addresses three main tasks: the definition of the FOREVER service architecture; the analysis of how diversity techniques can improve resilience; and the evaluation of the FOREVER service. The FOREVER service is an important contribution to intrustion-tolerant replication middleware and significantly enhances the resilience
Space-charge transport limits of ion beams in periodic quadrupole focusing channels
It has been empirically observed in both experiments and particle-in-cell
simulations that space-charge-dominated beams suffer strong growth in
statistical phase-space area (degraded quality) and particle losses in
alternating gradient quadrupole transport channels when the undepressed phase
advance sigma_0 increases beyond about 85 degrees per lattice period. Although
this criterion has been used extensively in practical designs of strong
focusing intense beam transport lattices, the origin of the limit has not been
understood. We propose a mechanism for the transport limit resulting from
classes of halo particle resonances near the core of the beam that allow
near-edge particles to rapidly increase in oscillation amplitude when the
space-charge intensity and the flutter of the matched beam envelope are both
sufficiently large. When coupled with a diffuse beam edge and/or perturbations
internal to the beam core that can drive particles outside the edge, this
mechanism can result in large and rapid halo-driven increases in the
statistical phase-space area of the beam, lost particles, and degraded
transport. A core-particle model is applied to parametrically analyze this
process. Extensive self-consistent particle in cell simulations are employed to
better quantify space-charge limit and verify core-particle model predictions.Comment: 17 pages, 5 figures. Submitted to Nuclear Instruments and Methods A.
Includes a long version of a conference talk (trans_limits_talk.pdf)
presented on the topic at the "Coulomb'05 -- High Intensity Beam Dynamics"
workshop (Senigallia, Italy, 12-16 September 2005). This talk presents
further supporting information/plots not included in the abbreviated,
draft-format manuscrip
EFFECT OF HIP ORIENTATION ON WINGATE ANAEROBIC POWER OUTPUT
The effect on anaerobic power output of Hip Orientation Angle (HOA, angle of hip joint to bottom bracket relative to horizontal) while maintaining a constant Body Configuration Angle (BCA, included angle between torso, hip, and bottom bracket) and maximum hipto- pedal distance was examined. In this way, changes in power output could be attributable to the altered pull of gravity on the lower extremity. Nineteen male recreational cyclists with no recent recumbent cycling experience completed 30 s Wingate tests in three recumbent positions (HOA of -20, -10, and 0°) and the standard cycling position (HOA = 75°), all with a 130° BCA. Neither peak, average, or minimum power were significantly different across all positions nor was fatigue index (p < 0.01). These findings suggest that anaerobic power is not altered by hip orientation
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